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AP sessions can last many hours, longer than the life of most laptop batteries.
Shutting down your laptop in the middle of a session to change the battery could be inconvenient to say the least, depending upon whether you are
controlling the mount and camera with the laptop , or only viewing the image
for instance. Batteries can be expensive, and sometimes not that easy to change. The power loss when using an inverter is typically around 5-6%, so not too significant. I used to power my laptop and my Canon 1100D with a $25 ebay 200W inverter [not a pure sine wave one of course at that price.]
raymo
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